“We call her ‘Crooked Hillary’ because she’s a crooked person. She’s always been a crooked person,” Trump said in an interview with Fox News on Friday.

“Clinton is a person who’s got many, many flaws… The only thing she’s got going is the women card,” and that she’s “the worst possible representative a woman can have,” he added.

At a campaign event in the US sate of Pennsylvania on the same day, Clinton said she would not respond to Trump’s comments about her.

Earlier this month, Trump had slammed the Democratic front-runner as “unqualified” to be the US president.

In the interview, the real estate mogul also promised his supporters that he would not bore them by becoming overly presidential, saying, “I can tell you that if I go too presidential, people are going to be very bored,” adding that he worried his supporters would “fall asleep.”

The remarks were made after Trump’s aides said he would project a more serious image after his win in New York’s nominating contest this week.

Trump’s victory in his home state of New York on Tuesday bolstered his chances for the Republican presidential nomination.